SR20 Reliability Build Questions

[King.D]

Originally Posted by fliprayzin240sx

20 psi on a stock T28?







Kicker is, he's planning on doing the headgasket anyways. He's gonna take the damn cams/head off either way. If he can change a head gasket with help from a couple of friends, I dont see how he can't put drop in cams with it.



Personally, I would go stock HG, ARP head studs, double rocker arm guides, fresh oil pump, water pump, Nismo thermo, Z32 Maf, clutch fan/shroud. For tuning, all up to you. People aren't a big fan of PFCs since they're. They're still good but there are better options nowadays for as much as it would cost you to get a new PFC, commander, dataloggit and tuning cost. You can do more with AEM.



Rom tuning, this is a cheaper alternative to running a standalone. I'm not a big fan of it but since you're in FL, JBB pretty much hit it on the head. Martin can rom tune your ECU on the dyno, that's the only way I'd run a rom tune. Mail order rom tunes...Never again.



From what folks who's done the double rocker arm guides, you can forgo rocker arm stoppers, but still wouldnt hurt to have them. If you're planning on getting fresh bronze valve guides and you plan on drifting (bouncing off the rev limiter), wouldnt hurt to run some stiffer valve springs and titanium retainers since you're already there.



Turbo wise, 300hp or 300whp? If whp, SpecR T28 may not be enough to get you there. Like KingTalon already said, GT28RS, maybe even a .64 trim GT2871R. Either way, 550cc wont be enough to support either turbo. I'd go atleast 650cc or even some 740cc. Wouldnt hurt nothing to have larger injectors since the car will be tuned for them, always better to have more than less. Plus you wont have to worry about getting another set of injectors when/if you decide you want more power later down the road. Also, if you decide to go larger turbo than the T28, get with CodyAce and get your stock manifold extrude honed/go external wastegate.



Only other thing you didnt take into consideration: Clutch and fuel pump. Run atleast an Exedy Stage 3 (3 puck) or ACT clutch (stay the fuck away from SPEC) and don't go Walbro if you want a reliable pump. Bosch 044, maybe even a brand new OEM Z32 TT pump.

550 would handle that t28 and but yes it is recommend to 650cc or 740cc i have 740s on mine ad its great


Mr.castro

[JohnnyDrfiter22]

I wanted a 300ish reliable SR myself..

OEM new piston rings
Tomei 1.1 HG
ARP headstuds
Rocker arms
ISIS 3871 Turbo tuned to 18psi
Sard 550cc inj. @75%
PBM high mount IC
PBM cobra DP
AEM V2

Motor made 308/260. very happy as I feel I have enough power and I don't worry about it.

[dorkidori_s13]

Originally Posted by JohnnyDrfiter22

I wanted a 300ish reliable SR myself..

OEM new piston rings
Tomei 1.1 HG
ARP headstuds
Rocker arms
ISIS 3871 Turbo tuned to 18psi
Sard 550cc inj. @75%
PBM high mount IC
PBM cobra DP
AEM V2

Motor made 308/260. very happy as I feel I have enough power and I don't worry about it.

hows that downpipe on clearance? i was thinking about picking one of those up... especially for the built in flex section!

[Dboyizmlg]

Here is the info on my set up I'm currently DD.

S13 black top SR20det
-T28 turbo (s15 spec-r late model), wich is basically an S14 T28 in a way
-Tomei 740cc injectors
-APEXI PFC
-3in elbow, to catback exhaust
-on E85 ethanol
-STOCK INTERNALS!

Made 285rwhp, and 310tq at 18psi (dropped down to 14-15 psi after 6k).
On a very safe tune! On a DYNApack dyno

I have just bought Tomei poncams last week, I will be putting them in soon.
Also will send out my exhaust manifold to get it extrude honed!

I should be a little over 300rwhp with that for sure.

I do recommend getting ARP headstuds, as I will also be doing.

[Dboyizmlg]

Originally Posted by Kingtal0n

A t-28 will not be happy at 300rwhp. not even at 280rwhp.

A t-28 from an oem sr20det is happy around 245rwhp. anything more than that is asking for trouble, excessive wear and tear.

if you want a reliable 300 from an sr20det then you need to upgrade to an aftermarket garret turbocharger, such as GT28RS.

camshafts would be a worthwhile investment, they will allow you to use less boost to make the same amount of power. No reason to go big with the camshafts; some S3's are perfect.

I have to agree with him here!!

As I know my T28 is going to see a lot of beating it will not have a long life at this power.

Gt2860rs, or Gt2871r would be ideal

[Shimadorisanni]

As of right now, my motor setup is quite basic and very stock.

Redtop SR
Tomei rocker arm stoppers
T25
Hks actuator
Blitz ebc
Blitz intercooler
ORC super single 409D
Stock injectors


I pretty much have the clutch thing, so I know I don't have to worry about that. And I agree about theory of the cams, as I too shared the same theory that they would allow me to boost less while making the same if not more power. PFC I can get relatively cheap, and would much rather have something MAP as Dorki said than MAF. Not really into fucking with MAFS anymore as they fail ALL the time. Thanks everyone for all this good information. It has really opened my eyes on other paths I could go to get this power goal. Keep in mind that I want 300whp. Not just 300hp. The only thing I don't understand is if I really do need to do something more than an s15 t28. Would a 2871R be safer?

[Dboyizmlg]

There is a lot of variable you have to keep in mind.

Kingtalon is right on point with his comment.

T28 DBB VERSION (91FOO version) is good and pretty safe at 16psi.
Any thing over that, and it will not live long.

Cams, exhaust manifold, and tune come into play now if you want to hit that 300rwhp mark.
Also depends if you are on pump gas, or E85.

But think of it this way...if for example you where to get the GT2871r with 740cc's, 14-15psi,
With a very conservative tune on pump gas! You should at or a little over 300rwhp (depending on what kind on Dyno, and how healthy your motor is).Also the Cams would be a nice addition here as you can lower the boost a bit and get same power.
This way you will not be putting any stress on the turbo.

So much stuff... Lol

[Silverbullet]

There is a whole thread on GT2871R's. It is a little convoluted being how ever many pages there are now, but long story short it is praising the 0.64 GT2871R for up to 400whp with the specific supporting flow upgrades.

On a more typical OEM manifolds and cam setup, you're looking around 350whp with the 2871R. You can always dial it slightly back for a more conservative 310-320whp. It will be slightly laggier than the 28R and 28RS, so that is something to consider.